There are over one hundred kinds of goldfish. The common goldfish has two sets of paired fins.
Goldfish have teeth in their throats which they use to crush food.
Goldfish can survive in water temperatures ranging from freezing to 30 degrees.
Goldfish spawn both in the spring and in the summer. Their eggs will stick to the water plants. Within a week the eggs will hatch.
Some goldfish have been known to live up to 25 years of age.
A Goldfish has a memory span of approximately 3 seconds.